Key result
Abolishment of tachyarrhythmia and treatment of thymoma resulted in the reversal of severe biventricular failure, suggesting tachycardia-induced cardiomyopathy as a potential cause.
Why the study?
Cardiomyopathy in newly diagnosed thymoma without myasthenia gravis has an unclear mechanism, motivating exploration of tachycardia-induced cardiomyopathy as a potential cause.
Case Report (n=1)
Tachycardia-induced cardiomyopathy should be considered as a potential mechanism for severe biventricular failure in patients with thymoma presenting with tachyarrhythmia, even in the absence of myasthenia gravis.
TIC may explain thymoma cardiomyopathy without MG; single case leaves mechanism hypothesis-generating and unconfirmed.
BACKGROUND Cardiomyopathy associated with thymoma is thought to be a cardiac manifestations of myasthenia gravis (MG). However, there are case reports of newly diagnosed thymoma presenting with cardiomyopathy without MG, and the mechanism remains unclear. The purpose of this report is to explore tachycardia-induced cardiomyopathy (TIC) as a potential mechanism for cardiomyopathy in thymoma without features of MG. CASE REPORT A 31-year-old man presented with atrial flutter with right bundle branch block and severe biventricular heart failure. Echocardiogram revealed severe left ventricle ejection fraction (LVEF) of 15% with biventricular dilation with impaired systolic function. Computer tomography coronary angiography demonstrated normal coronary artery disease. Cardiac magnetic resonance imaging showed normal T1 and T2 mapping, without inflammation or edema. A large anterior mediastinal mass was found on computer tomography chest. Mediastinal mass biopsy identified type B3 thymoma (WHO classification) with dual population of large, uniform epithelial thymic cells and immature T cell phenotype. Acetylcholine receptor antibody was positive without clinical features of MG and hypogammaglobulinemia indicating Good syndrome. He was treated with antiarrhythmic and heart failure pharmacotherapy, carboplatin and paclitaxel, and intravenous immunoglobulin. He demonstrated reversible heart failure following abolishment of tachyarrhythmia, consistent with tachycardia-induced cardiomyopathy. CONCLUSIONS We report a rare case of a newly diagnosed thymoma and Good syndrome without clinical features of MG presenting with tachyarrhythmia and severe biventricular failure. The reversibility of the cardiomyopathy following abortion of tachyarrhythmia with treatment highlights TIC as a potential cause.
No takes yet. Share an insight, caveat, or question.
Lim et al. (2025) conducted a case report in Thymoma-induced severe biventricular failure (n=1). Antiarrhythmic therapy, heart failure pharmacotherapy, and chemotherapy was evaluated on Improvement in left ventricular ejection fraction and heart failure symptoms. Abolishment of tachyarrhythmia and treatment of thymoma resulted in the reversal of severe biventricular failure, suggesting tachycardia-induced cardiomyopathy as a potential cause.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: